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The classic New Zealand  identification guide. Every home should have one. Buy it here.

Cyathodes fasciculata= Leucopogon fasciculata, Mingimingi

Leaves 1-2.5 cm linear-oblong  and arranged in bundles or whorls. A Juvenile form to 40cm tall may diplay leaves  4cm with larger leaves. Shrub reaching 5m.
Often in dry spots
North Cape to Canterbury
This common plant of scrublands and beech forests can be mistaken for a Manuka or kanuka. It has a distinctive adult and juvenile form which adds to the difficulty in identification. The younger leaves are larger than the adults. as a tree it can grow to 5m. and produces small green  flowers on spikes in spring. The berries are about .8 mm long and occur in strings in autumn.
Wash the seeds from the berries. 1 seed per berry. Sow straight away. It may take 3 or 4 months before germination.

Cyathodes juniperina Mingimingi

Similar to C.fasciculata however, it has pungent leaves, prickly to touch and single drupes which may be colored red, pink, or white. no juvenile form.

Leaves 6-16mm long, needle like, pungent. Shrub reaching 5m. flowers 2-3mm long.. found throughout all NZ in forest and scrub.

I recommend the following books for aiding in NZ native plant identification